Improved battery safety via in-situ dip-coated composite gel polymer electrolytes

Xiaoli PENG, Yanlin ZHU, Shipai SONG, Xiaokun ZHANG, Yong XIANG*

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

10 Citations (Scopus)

Abstract

A new type of PVC-CPVC-MBS-B44 composite gel polymer electrolyte (GPE), based on LiTFSI and incorporated with nano-silica, is designed. The adhesion of the electrolyte membranes is improved by introducing B44, with its excellent adhesion ability, into the GPEs. The GPE membrane is coated on the anodes by an in-situ dip-coating process for battery assembly, reducing the interfacial resistance of the battery. The PVC-CPVC-MBS-B44 composite GPE exhibits superior electrochemical performance. The electrochemical window is over 4.9 V (vs. Li/Li+), the ion conductivity is 0.96 × 10- 3 S cm−1 at an ambient temperature, and the lithium ion transference number is 0.61. The LiCoO2/PVC-CPVC-MBS-B44 composite GPE/graphite cells exhibit maximum discharge capacities of approximately 137.98, 136.5, and 129.4 mAh g−1 at 0.2C, 0.5C, and 1C discharge rates, respectively. The cells with GPE can maintain a high discharge capacity of 116 mAh g−1 and a capacity retention exceeding 82.9% after 200 cycles at 0.5C. Heavy impact, nail penetration, crush test, short-circuit test, drop test and heating test are carried out on 1-Ah GPE pouch cells, and the battery does not ignite nor smoke. A battery prepared using the proposed approach can deliver outstanding safety, high rate capabilities, and superior cycle stability, making it a potential candidate for various applications.

Original languageEnglish
Article number227963
Number of pages9
JournalJournal of Power Sources
Volume455
Early online date1 Mar 2020
DOIs
Publication statusPublished - 15 Apr 2020
Externally publishedYes

Bibliographical note

This work was supported by the Fundamental Research Funds for Central Universities (Contract No. ZYGX2019Z009); Sichuan Province Science and Technology Support Program (Contract No. 2018JY0554).

Keywords

  • Battery safety
  • Composite
  • Dip-coating
  • Gel polymer electrolyte
  • Lithium ion battery

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